The UFC women’s bantamweight champion delivered nine consecutive right hands to a downed Alexis Davis to retain her title in just 16 seconds and improve to 10-0 in the co-main event at UFC 175 on Saturday night at Mandalay Bay Events Center.

The finish was the second-fastest knockout in a UFC title bout next to heavyweight Andrei Arlovski’s 15-second finish of Paul Buentello at UFC 55 in 2005

After a brief exchange of punches in the center of the ring, Rousey landed an overhand right and a knee to the body, grabbed Davis (16-6) and executed one of her patented judo throws.

Rousey landed with her left side on Davis and had both of Davis’ arms isolated. With nowhere to go, Davis absorbed nine consecutive blows before referee Yves Lavigne jumped in to stop the fight.

Davis was conscious but appeared out of it for several minutes after the stoppage. After her arm was raised and the official decision was read, Rousey embraced Davis with an almost apologetic look on her face.

“We had been specifically working on the long overhand right and long left hook in this training camp,” Rousey said. “Before my fight with Sara McMann (at UFC 170 in February), we had been training the inside knee to the body. It just seems that whatever I’m working on in training camp, I have implemented effectively in the fight.”

The 27-year-old Venice resident finished McMann with a knee to the liver in just 66 seconds. Rousey, who ended her first eight fights by submission with her vaunted armbar, has now finished her past two fights by knockout in the first round.

The victory celebration was tempered first by an awkward post-fight interview in the Octagon, followed by news that Rousey injured her right hand and is going to have minor knee surgery.

Commentator Joe Rogan, receiving a cue from the production truck via his earpiece, asked Rousey about possibly fighting next month at UFC 176 at Staples Center.

Rousey, who later said she was surprised by the question but has always been game to fight any time asked, politely replied: “I’m scheduled for knee surgery already. I’m going to talk to my coaches, and if they say it’s cool with them, it’s cool with me. I’ll do it.”

UFC President Dana White, however, did not appear happy with the query and stepped forward to correct Rogan.

At the post-fight press conference, White said he wasn’t upset with Rogan, but criticized his production team for suggesting the question.

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“That was some (expletive) that somebody made up back there,” White said. “It was the biggest idiotic move in the history of our production team.”

Rousey explained at the press conference that she needed arthroscopic knee surgery for “things floating around in there,” but said her ligaments were fine.

The champion also needed nine stitches on the second knuckle of her right hand after a cyst, which developed when her kncuckle was first inured before her fight with Miesha Tate in December, burst and caused a big gash.

“I kept covering it up and hitting on it still, just making sure it didn’t get infected. I guess I ended up building a cyst under my knuckle,” Rousey said. “I ripped it open on the first overhand right.”

Rousey downplayed both injuries and said she would still welcome fighting at the end of the year, which would make an impressive four title defenses in one year.

“Right hand and right knee, but I’m left-handed, so it’s all good,” she said with a smile.

In the main event in front of an announced crowd of 10,088, Chris Weidman defended his middleweight title via unanimous decision in a spectacular battle against Lyoto Machida.

The judges scored it 49-45, 48-47, 49-46 for the New York fighter, who successfully defended his belt for the second time in less than eight months.

“He’s as good as I thought,” Weidman said. “Quick. When you think he’s going to do something, he does the opposite. He’s real tricky and tough as nails.”

Weidman (12-0) appeared to take the fight to Machida (21-5) for the first three rounds, even opening a cut on the challenger’s right eyebrow.

In the fourth, the Brazilian and Redondo Beach resident came alive, catching Weidman with several lefts to the jaw. His biggest punch might have come at the end of the round when he staggered the champ as the horn sounded.

In the fifth round, Weidman appeared to tap into his reserve tank. The two traded often, but Weidman secured a takedown with less than two minutes left to essentially seal it. With another cut under his left eye, Machida rallied at the end with some good striking, but Weidman’s chin held up.

“I feel happy with my performance, but I know when I go home I’ll feel a little sad I didn’t get the belt,” said Machida, a former UFC light heavyweight champion who was attempting to join Randy Couture and B.J. Penn as the only fighters to win title in two weight classes.

It was Machida’s first loss in three fights at 185 pounds.

In another main-card fight, Uriah Hall showed he is indeed a fighter after being questioned by UFC President Dana White following his disappointing follow-up to his appearance on Season 17 of “The Ultimate Fighter.”

After breaking the second toe on his right foot in the first round, Hall soldiered on and did enough against Thiago Santos to earn the unanimous-decision victory.

The judges scored it 29-28, 29-28, 30-27 for the New York middleweight.

Footage between the first and second rounds showed Hall’s mangled toe on the big screen, eliciting a stunned reaction from the crowd.

Santos (9-3) stayed busy and Hall (10-4) countered and scored. On top of that, Hall continued throwing kicks with his right foot, saying in his post-fight interview, “I would feel my bone shift in and out of my skin.”

In the opening bout of the main card, Russell Doane pulled off a split-decision victory over Marcus Brimage.

The judges scored the bout 29-28, 28-29, 30-27 for Doane (14-3), despite what many thought was a dominant third round for Brimage (6-3).